A new photoinduced fluorescent switch based on a photochromic diarylethene with a rhodamine fluorophore

Structure, Photochromism and Liquid Crystal Properties of 1-Alkyl-2-(Arylazo)Imidazoles (Raai-C<sub>n</sub>H<sub>2n+1</sub>, n (Even) = 10 - 22)

“…It is defined as "re-versible transformation of a chemical species induced in one or both directions by the absorption of electromagnetic radiation between two forms having different absorption spectra" [9]. The photochromic compounds have become appealing for their potential advantages in the construction of photo-switching devices and supramolecular architectures [9][10][11][12][13][14][15]. Various organic compounds show cis(Z)/trans(E) isomerization, pericyclic reactions, H atom transfer reactions, and dissociation processes.…”

“…Therefore, E/Z photoisomerization of the azobenzene in the N phase can disorganize the phase structure of NLCs, resulting in a nematic-isotropic (N-I) isothermal phase transition (photochemical phase transition). In this article, we describe a preliminary account on photochromic LC (PLC) activity of some long chain alkyl group substituted 1-alkyl-2-(arylazo)imidazoles, Raai-C n H 2n+1 (n = 10,12,14,16,18,20,22).…”

“…Liquid crystal (LC) is a long-range orientational order of the molecules in between solid and isotropic liquid phases which share the properties of the crystal and liquid phases. 1-Alkyl-2-(arylazo)imidazoles, (Raai-C n H 2n+1 , R = H, Me and n = 10, 12,14,16,18,20,22) exhibits photochromism and two of them (Haai-C 18 H 37 and Haai-C 22 H 45 ) show Liquid crystal (LC) properties. One of these compounds, Meaai-C 16 H 33 is structurally characterized by single crystal X-ray diffraction study.…”

Highly selective fluorescent chemosensors for the detection of Hg2+ based on photochromic diarylethenes with a terminal terpyridine unit

“…7 Previously, our group revealed that the diarylethenes with a rhodamine or salicylidene Schiff base unit could be selective chemosensors towards Al 3+ with significant color and fluorescence changes. [8][9][10] The obtained results have contributed to a broader understanding of the specific recognition characteristics of photochromic diarylethenes toward metal ions.…”

Dual sensing performance of a rhodamine-derived scaffold for the determination of Cu2+ and Ce4+ in aqueous media

“…Rhodamine 6G derivatives have received substantial attention as chemosensors with useful properties, such as high absorption coefficients and high fluorescent quantum yields for excitation and emission wavelengths within the visible region [38,39]. The introduction of the rhodamine moiety to construct chemosensors of the "off-on" type is a reliable method because of the well-known spirolactam (fluorescence "off") to ring-opened amide (fluorescence "on") equilibrium of rhodamine derivatives.…”